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The XT8G is a Go To I believe? If so the illuminated eyepiece is to assist with accurate alignment during setup. If using the scope in a go to mode, All you would normally need is a red dot finder to find bright stars. That is all I use on my 20".
Another point, telrads can be quite heavy, that's why I don't use, tend to unbalance a dob!
Cheers
Malcolm
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